Up to now, this is a tense and well-played game. The position remains very complicated, and we will see a few mistakes in the remainder of the game.
20... c8c4 Another benefit of forcing White's bishop to c2: the rook uses the excellent c4-square as an outpost and Black is ready to double on the c-file. 21. e5f6 White cedes the bishop pair for a good cause: damaging the kingside and creating threats around the black king. 21... g7f6  22. d1h5  22... g8f8 